Length
5 minutes
Words per minute
168.16
Word count
870
Sentence count
77
Vitamin D is the key to optimising your immune system. If you don't have access to sun, supplementing with vitamin D is a great idea. I have taken vitamin D for 8 years and it has made a massive difference to my overall health and well-being. A healthy immune system is not built by sitting secluded in your home, mistreating your body.